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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (5,828) $ (23,676) $ (3,913)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation 372 572 644
Lease amortization 1,429 1,516 1,946
Net loss (gain) on disposal of assets (33)   5
Gain on liquidation of a subsidiary (6)    
Reversal of guarantee obligations (ASC 460) reserve upon expiration of statute of limitations (42)   (1,182)
Investment impairment 1,029
Gain on reversal of accounts payable     (3,161)
Stock-based compensation expense 504 703 1,399
Allowance for/(recovery of) credit losses (9,158) 9,441 4,396
Allowance for inventory 4,573 170 1,904
Deferred income taxes 2,052 (1,499) (465)
Changes in operating assets and liabilities      
Accounts receivable 31,336 18,767 (21,561)
Inventories and deferred costs 578 (230) 18,278
Prepaids and other assets (4,595) 600 (3,625)
Accounts payable (6,089) (5,754) (19,882)
Income taxes payable 2,832 (1,894) 506
Customer advances (160) 231 (401)
Deferred revenue (329) (1,254) (2,259)
Other liabilities 2,393 (2,122) 3,224
Net cash provided by (used in) investing activities 19,829 (3,400) (24,147)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (348) (115) (507)
Purchase of short-term investments     (41)
Proceeds from sale of short-term investments 2,100 2,095 41
Net cash provided by (used in) investing activities 1,752 1,980 (507)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from exercise of stock options     56
Proceeds from short-term borrowing     4,625
Repayment of short-term borrowing     (4,625)
Repurchase of ordinary shares   (374) (1,049)
Net cash used in financing activities   (374) (993)
Effect of exchange rate changes on cash and cash equivalents (3,693) 1,575 554
Net decrease in cash and cash equivalents 17,888 (219) (25,093)
Cash, cash equivalents and restricted cash at beginning of year 48,388 48,607 73,700
Cash, cash equivalents and restricted cash at end of year 66,276 48,388 48,607
Cash paid:      
Interest paid   10 16
Income taxes paid $ 800 $ 2,100 $ 1,400